org.metawidget.swt.widgetbuilder.OverriddenWidgetBuilder Maven / Gradle / Ivy
// Metawidget (licensed under LGPL)
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package org.metawidget.swt.widgetbuilder;
import static org.metawidget.inspector.InspectionResultConstants.*;
import java.util.Map;
import org.eclipse.swt.widgets.Control;
import org.metawidget.swt.SwtMetawidget;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;
/**
* WidgetBuilder for overridden widgets in SWT environments.
*
* Locates overridden widgets based on a name attribute in their setData.
*
* Because of the way SWT requires Controls to nominate their Composite
* up-front (ie. in their constructor), the behaviour of OverriddenWidgetBuilder is
* limited to only overriding Controls within their immediate Composite.
* Therefore OverriddenWidgetBuilder will not work if used to override
* Controls that are laid out inside, say, a TabFolderLayoutDecorator.
*
* @author Richard Kennard
*/
public class OverriddenWidgetBuilder
implements WidgetBuilder {
//
// Public methods
//
public Control buildWidget( String elementName, Map attributes, SwtMetawidget metawidget ) {
String name = attributes.get( NAME );
if ( name == null ) {
return null;
}
for ( Control componentExisting : metawidget.getChildren() ) {
if ( name.equals( componentExisting.getData( NAME ) ) ) {
return componentExisting;
}
}
return null;
}
}